وَلِلَّهِ يَسْجُدُ مَن فِي السَّمَاوَاتِ وَالْأَرْضِ طَوْعًا وَكَرْهًا وَظِلَالُهُم بِالْغُدُوِّ وَالْآصَالِ ۩ (15)
(13:15) For it is Allah alone before Whom everything in the heavens and the earth bows down willingly or un-willingly, *24 and the shadows of all things bow down before Him in the morning and the evening. *25
*24) "... everything in the heavens and the earth bows down before Allah" in the same sense that every creation of His has to obey and submit to His Physical Law in every detail. The only difference between the submission of a Believer and an unbeliever is that the former submits to it with a willing heart while the latter is forced to do so against his will, for it is absolutely beyond his power to oppose it.
*25) "The shadows bow down" in the sense that they fall to the west in the morning and to the cast in the evening and so on. This shows that they, too, have to submit to some Law.